/* roulang page: index */
:root{
--brand:#2B5F8F;--brand-d:#1F4A73;--brand-l:#E9F2FA;--accent:#F08A4B;
--ink:#17212B;--text:#4F6070;--muted:#7A8A99;--bg:#F6F8FB;--card:#FFFFFF;
--line:#E2EAF2;--ok:#2E8B72;--r:14px;
--sh:0 10px 30px rgba(23,42,64,.08);--sh-h:0 16px 36px rgba(23,42,64,.12);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;font-size:16px;line-height:1.7;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
h1,h2,h3{margin:0;color:var(--ink);font-weight:800;line-height:1.2}
p{margin:0}
a{color:inherit;text-decoration:none}
ul,ol{margin:0;padding:0;list-style:none}
img{display:block;max-width:100%}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}

/* header */
.site-head{position:sticky;top:0;z-index:80;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 2px 14px rgba(23,42,64,.05)}
.head-in{display:flex;align-items:center;gap:20px;height:72px}
.logo{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.logo-mark{width:36px;height:36px;border-radius:10px;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:800;font-size:17px}
.logo-text{display:flex;flex-direction:column;line-height:1.15}
.logo-name{font-size:18px;font-weight:700;color:var(--ink);letter-spacing:.4px}
.logo-sub{font-size:11px;color:var(--muted)}
.nav{display:flex;align-items:center;gap:2px;margin-left:auto}
.nav a{padding:8px 13px;border-radius:8px;font-size:15px;color:var(--text);transition:background .2s,color .2s}
.nav a:hover{background:var(--brand-l);color:var(--brand-d)}
.nav a.active{background:var(--brand-l);color:var(--brand-d);box-shadow:inset 0 -2px 0 var(--brand)}
.head-tag{display:flex;align-items:center;gap:7px;font-size:12px;color:var(--ok);background:#EAF6F1;padding:7px 13px;border-radius:999px;white-space:nowrap}
.dot{width:6px;height:6px;border-radius:50%;background:var(--ok)}
.burger{display:none;width:44px;height:44px;margin-left:auto;border:1px solid var(--line);background:#fff;border-radius:10px;flex-direction:column;justify-content:center;align-items:center;gap:5px;cursor:pointer}
.burger span{display:block;width:18px;height:2px;background:var(--ink);border-radius:2px}

/* hero */
.hero{position:relative;overflow:hidden;padding:76px 0 84px;background:#EDF4FA;scroll-margin-top:88px}
.hero::before{content:"";position:absolute;inset:0;background:url("/assets/images/c27e6fba228fa267.jpg") center/cover no-repeat;opacity:.16}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(246,248,251,.55),rgba(246,248,251,.96))}
.hero .container{position:relative;z-index:2}
.hero-in{max-width:840px;margin:0 auto;text-align:center}
.pill{display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid #DCE9F5;color:var(--brand-d);font-size:13px;font-weight:600;padding:6px 15px;border-radius:999px}
.pill i{width:6px;height:6px;border-radius:50%;background:var(--accent);display:block}
.hero h1{font-size:52px;letter-spacing:-.5px;margin-top:20px}
.hero h1 .hl{color:var(--brand)}
.hero-sub{font-size:18px;font-weight:600;color:var(--ink);margin-top:14px}
.hero-desc{max-width:700px;margin:14px auto 0;font-size:15.5px}
.searchbar{display:flex;gap:8px;background:#fff;border:1px solid #DCE9F5;border-radius:14px;padding:7px;max-width:620px;margin:26px auto 0;box-shadow:var(--sh)}
.searchbar input{flex:1;min-width:0;height:44px;border:0;background:transparent;padding:0 12px;font-size:15px;color:var(--ink);font-family:inherit}
.searchbar input::placeholder{color:var(--muted)}
.searchbar input:focus{outline:none}
.chip-row{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-top:16px}
.chip{font-size:13px;color:var(--brand-d);background:#fff;border:1px solid #DCE9F5;border-radius:999px;padding:6px 14px;transition:background .2s,border-color .2s}
.chip:hover{background:var(--brand-l);border-color:#C4DCEF}
.hero-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin-top:26px}
.hero-stats{display:flex;flex-wrap:wrap;justify-content:center;gap:36px;margin-top:30px}
.hs{text-align:center}
.hs b{display:block;font-size:24px;color:var(--brand);font-weight:800;line-height:1.2}
.hs span{font-size:12.5px;color:var(--muted)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:46px;padding:0 22px;border-radius:10px;font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;transition:background .2s,box-shadow .2s,transform .15s,color .2s;font-family:inherit}
.btn .ar{transition:transform .2s}
.btn:hover .ar{transform:translateX(3px)}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-d);box-shadow:0 10px 22px rgba(43,95,143,.24)}
.btn-ghost{background:#fff;color:var(--brand-d);border-color:#C9DCEC}
.btn-ghost:hover{background:var(--brand-l);box-shadow:0 8px 20px rgba(43,95,143,.12)}
.btn:active{transform:translateY(1px)}

/* sections */
.sec{padding:84px 0;background:#fff;scroll-margin-top:88px}
.sec.alt{background:var(--bg)}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:40px}
.eyebrow{font-size:12.5px;font-weight:700;color:var(--brand);letter-spacing:1.4px}
.sec h2{font-size:30px;margin-top:8px}
.sec-desc{font-size:15px;color:var(--muted);margin-top:10px;max-width:760px}
.sec-link{font-size:13.5px;color:var(--brand);font-weight:600;white-space:nowrap;background:var(--brand-l);padding:7px 14px;border-radius:999px}
.split{display:grid;gap:56px}
.s48{grid-template-columns:4fr 8fr}
.s57{grid-template-columns:5fr 7fr}
.s66{grid-template-columns:1fr 1fr}
.sticky{position:sticky;top:100px;align-self:start}
.sub-title{font-size:17px;margin-bottom:18px;display:flex;align-items:center;gap:8px}
.sub-title span{font-size:12px;font-weight:600;color:var(--brand);background:var(--brand-l);padding:3px 10px;border-radius:999px}

/* pain */
.pain-list li{display:flex;gap:20px;padding:26px 0;border-top:1px solid var(--line)}
.pain-list li:last-child{border-bottom:1px solid var(--line)}
.num{font-size:15px;font-weight:800;color:var(--brand);font-family:"Barlow","DIN Alternate",sans-serif;letter-spacing:1px;flex:0 0 34px;line-height:1.6}
.pain-list h3{font-size:18px;margin-bottom:6px}
.pain-list p{font-size:15px}

/* solution */
.points{margin-top:22px}
.points li{position:relative;padding-left:20px;font-size:15px;margin-bottom:14px}
.points li::before{content:"";position:absolute;left:0;top:11px;width:8px;height:2px;background:var(--brand);border-radius:2px}
.preview{background:#fff;border:1px solid #E7EEF6;border-radius:16px;padding:20px;box-shadow:var(--sh)}
.pv-head{font-size:13px;font-weight:700;color:var(--muted);letter-spacing:1px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.pv-list li{display:flex;gap:14px;align-items:center;padding:14px 0;border-bottom:1px solid var(--line)}
.pv-list li:last-child{border-bottom:0;padding-bottom:0}
.pv-thumb{flex:0 0 104px;width:104px;aspect-ratio:16/9;border-radius:8px;overflow:hidden;background:var(--brand-l)}
.pv-thumb img{width:100%;height:100%;object-fit:cover}
.pv-t{font-size:15px;font-weight:600;color:var(--ink)}
.pv-m{font-size:12.5px;color:var(--muted);margin-top:3px}

/* category */
.g3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.cat-card{display:flex;gap:16px;background:#fff;border:1px solid #E7EEF6;border-radius:var(--r);padding:22px;box-shadow:var(--sh);transition:transform .2s,box-shadow .2s}
.cat-card:hover{transform:translateY(-4px);box-shadow:var(--sh-h)}
.cat-icon{flex:0 0 44px;width:44px;height:44px;border-radius:12px;background:var(--brand-l);color:var(--brand-d);display:grid;place-items:center;font-weight:800;font-size:17px}
.cat-card h3{font-size:18px}
.cat-card p{font-size:14px;margin-top:6px;color:var(--text)}
.cat-more{display:inline-block;margin-top:10px;font-size:13px;font-weight:600;color:var(--brand)}
.cat-more:hover{color:var(--brand-d);text-decoration:underline}

/* video cards */
.g4{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.g3b{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.vcard{background:#fff;border:1px solid #E7EEF6;border-radius:var(--r);padding:10px;box-shadow:var(--sh);transition:transform .2s,box-shadow .2s}
.vcard:hover{transform:translateY(-4px);box-shadow:var(--sh-h)}
.thumb{position:relative;aspect-ratio:16/9;border-radius:10px;overflow:hidden;background:var(--brand-l)}
.thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.vcard:hover .thumb img{transform:scale(1.03)}
.badge{position:absolute;font-size:11px;font-weight:600;line-height:1;padding:5px 8px;border-radius:999px;background:rgba(23,33,43,.72);color:#fff;backdrop-filter:none}
.b-cat{top:8px;left:8px;background:rgba(255,255,255,.94);color:var(--brand-d)}
.b-time{bottom:8px;right:8px}
.b-time.accent{background:var(--accent);color:#fff}
.vbody{padding:12px 6px 4px}
.vtitle{font-size:16px;font-weight:600;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;transition:color .2s}
.vcard:hover .vtitle{color:var(--brand)}
.vmeta{font-size:12.5px;color:var(--muted);margin-top:7px}

/* steps */
.steps li{display:flex;gap:16px;padding:20px 0;border-top:1px solid var(--line)}
.steps li:first-child{border-top:0;padding-top:0}
.steps h3{font-size:17px;margin-bottom:5px}
.steps p{font-size:14.5px}

/* ranking */
.data-cards{display:grid;gap:14px}
.dc{display:flex;align-items:baseline;gap:12px;background:#fff;border:1px solid #E7EEF6;border-radius:12px;padding:18px 20px;box-shadow:var(--sh)}
.dc b{font-size:30px;font-weight:800;color:var(--brand);font-family:"Barlow","DIN Alternate",sans-serif;line-height:1}
.dc span{font-size:14px}
.dc-note{font-size:12.5px;color:var(--muted);line-height:1.7;margin-top:4px}
.rank{background:#fff;border:1px solid #E7EEF6;border-radius:16px;padding:8px 22px;box-shadow:var(--sh)}
.rank li{display:grid;grid-template-columns:44px 1fr 130px auto;align-items:center;gap:14px;padding:14px 0;border-bottom:1px solid var(--line)}
.rank li:last-child{border-bottom:0}
.rank .num{flex:none;line-height:1.4}
.rank .top .num{color:var(--accent)}
.r-name{font-size:15px;font-weight:600;color:var(--ink)}
.r-cat{font-size:11.5px;color:var(--brand-d);background:var(--brand-l);padding:2px 8px;border-radius:999px;margin-left:8px;font-weight:600;white-space:nowrap}
.heat{height:6px;background:#EDF2F8;border-radius:999px;overflow:hidden}
.heat i{display:block;height:100%;background:var(--brand);border-radius:999px}
.rank .top .heat i{background:var(--accent)}
.r-score{font-size:13px;color:var(--muted);white-space:nowrap;font-weight:600}

/* testimonials */
.q-big,.q-sm{margin:0;background:#fff;border:1px solid #E7EEF6;border-radius:16px;box-shadow:var(--sh)}
.q-big{padding:34px;display:flex;flex-direction:column;justify-content:space-between;gap:26px}
.q-big blockquote,.q-sm blockquote{margin:0;color:var(--ink);font-size:17px;line-height:1.8}
.q-sm{padding:24px}
.q-sm blockquote{font-size:15px}
.q-big cite,.q-sm cite{display:block;margin-top:14px;font-style:normal;font-size:12.5px;color:var(--muted)}
.q-big .mark{font-size:34px;color:var(--brand-l);font-weight:800;line-height:1}
.q-col{display:grid;gap:20px;align-content:start}

/* audience */
.aud{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.aud li{display:flex;gap:16px;background:#fff;border:1px solid #E7EEF6;border-radius:var(--r);padding:22px;box-shadow:var(--sh)}
.aud-icon{flex:0 0 40px;width:40px;height:40px;border-radius:10px;background:var(--brand-l);color:var(--brand-d);display:grid;place-items:center;font-weight:800;font-size:15px}
.aud h3{font-size:16px}
.aud p{font-size:14px;margin-top:5px}

/* news */
.news-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.news-item{display:flex;gap:16px;background:#fff;border:1px solid #E7EEF6;border-radius:var(--r);padding:14px;box-shadow:var(--sh);transition:transform .2s,box-shadow .2s}
.news-item:hover{transform:translateY(-3px);box-shadow:var(--sh-h)}
.news-thumb{flex:0 0 150px;width:150px;aspect-ratio:4/3;border-radius:10px;overflow:hidden;background:var(--brand-l)}
.news-thumb img{width:100%;height:100%;object-fit:cover}
.news-item h3{font-size:16px;line-height:1.5;margin-top:8px}
.news-item:hover h3{color:var(--brand)}
.news-meta{display:flex;align-items:center;gap:10px;font-size:12px;color:var(--muted)}
.tag{font-size:11.5px;font-weight:600;color:var(--brand-d);background:var(--brand-l);padding:2px 9px;border-radius:999px}
.news-item.featured,.news-item.wide{grid-column:span 2}
.news-item.featured .news-thumb{flex-basis:320px;width:320px}
.news-item.featured h3{font-size:19px}

/* metrics */
.metrics{display:grid;grid-template-columns:repeat(6,1fr);gap:16px}
.m-item{background:#fff;border:1px solid #E7EEF6;border-radius:var(--r);padding:24px 14px;text-align:center;box-shadow:var(--sh)}
.m-num{font-size:36px;font-weight:800;color:var(--brand);line-height:1.1;font-family:"Barlow","DIN Alternate",sans-serif}
.m-item span{display:block;font-size:12.5px;color:var(--muted);margin-top:6px}

/* faq */
.faq details{border:1px solid #E7EEF6;border-radius:12px;background:#fff;padding:0 20px;margin-bottom:12px;box-shadow:0 6px 18px rgba(23,42,64,.05)}
.faq summary{cursor:pointer;list-style:none;padding:18px 0;font-weight:600;color:var(--ink);font-size:15.5px;display:flex;justify-content:space-between;align-items:center;gap:14px;min-height:44px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--brand);font-size:20px;font-weight:700;line-height:1}
.faq details[open] summary::after{content:"−"}
.faq details p{padding:0 0 18px;font-size:15px;margin:0}

/* cta */
.cta-band{display:flex;align-items:center;justify-content:space-between;gap:32px;background:var(--brand-l);border:1px solid #D6E7F5;border-radius:18px;padding:44px 48px}
.cta-band h2{font-size:28px}
.cta-band p{font-size:15px;margin-top:10px;max-width:560px}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap;flex:0 0 auto}

/* footer */
.site-foot{background:#EEF3F8;border-top:1px solid var(--line);padding:56px 0 26px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px}
.foot-brand p{font-size:13.5px;margin-top:14px;line-height:1.8;max-width:280px}
.foot-col h3{font-size:14px;color:var(--ink);margin-bottom:14px}
.foot-col li{margin-bottom:10px;font-size:13.5px}
.foot-col a{color:var(--text);transition:color .2s}
.foot-col a:hover{color:var(--brand)}
.foot-bottom{margin-top:40px;padding-top:20px;border-top:1px solid #DCE7F2;display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;font-size:12.5px;color:var(--muted)}

@media (max-width:1024px){
.container{padding:0 20px}
.nav{position:fixed;top:0;right:0;height:100vh;width:280px;background:#fff;flex-direction:column;align-items:stretch;padding:88px 18px 24px;gap:2px;transform:translateX(105%);transition:transform .28s;box-shadow:-14px 0 34px rgba(23,42,64,.14);margin-left:0;z-index:90}
.site-head.open .nav{transform:translateX(0)}
.nav a{padding:13px 14px;font-size:15px;border-left:3px solid transparent;border-radius:0 8px 8px 0}
.nav a.active{border-left-color:var(--brand);box-shadow:none}
.burger{display:flex;position:relative;z-index:95}
.head-tag{display:none}
.hero{padding:60px 0 66px}
.hero h1{font-size:42px}
.sec{padding:64px 0}
.sec h2{font-size:27px}
.split{gap:40px}
.s48,.s57,.s66{grid-template-columns:1fr}
.sticky{position:static}
.g4{grid-template-columns:repeat(3,1fr)}
.g3{grid-template-columns:repeat(2,1fr)}
.metrics{grid-template-columns:repeat(3,1fr)}
.rank li{grid-template-columns:40px 1fr 100px auto}
.cta-band{padding:34px;flex-direction:column;align-items:flex-start}
.foot-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:768px){
.hero h1{font-size:36px}
.hero-sub{font-size:16px}
.sec h2{font-size:25px}
.sec{padding:56px 0}
.sec-head{flex-direction:column;align-items:flex-start;gap:14px;margin-bottom:30px}
.g4{grid-template-columns:repeat(2,1fr);gap:16px}
.g3b{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:1fr}
.aud{grid-template-columns:1fr}
.news-grid{grid-template-columns:1fr}
.news-item.featured,.news-item.wide{grid-column:span 1}
.news-item.featured .news-thumb{flex-basis:150px;width:150px}
.news-item.featured h3{font-size:16px}
.metrics{grid-template-columns:repeat(2,1fr)}
.rank li{grid-template-columns:36px 1fr auto}
.heat{display:none}
.q-big{padding:26px}
.cta-band{padding:28px}
.cta-band h2{font-size:23px}
}
@media (max-width:520px){
.container{padding:0 16px}
.hero{padding:48px 0 54px}
.hero h1{font-size:32px}
.hero-stats{gap:22px}
.hs b{font-size:20px}
.searchbar{flex-direction:column}
.searchbar .btn{width:100%}
.hero-actions .btn{flex:1 1 100%}
.sec{padding:44px 0}
.sec h2{font-size:23px}
.g4{grid-template-columns:repeat(2,1fr);gap:14px}
.vcard{padding:8px}
.vbody{padding:10px 4px 2px}
.vtitle{font-size:14.5px}
.pain-list li{padding:20px 0;gap:14px}
.pv-thumb{flex-basis:80px;width:80px}
.news-item{gap:12px;padding:12px}
.news-thumb{flex-basis:110px;width:110px}
.news-item.featured .news-thumb{flex-basis:110px;width:110px}
.metrics{grid-template-columns:repeat(2,1fr);gap:12px}
.m-num{font-size:30px}
.foot-grid{grid-template-columns:1fr;gap:26px}
.cta-band{padding:24px 20px}
}